Honsel



Jan. 31. 1956 c. HONSEL MANUFACTURE OF PAPER BAGS 2 Sheets-Sheet 1 Filed July 2, 1951 Inventor: a H0/VJ'5L ffzmr g I Jan. 31, 1956 c. HONSEL. 2,732,774

MANUFACTURE OF PAPER BAGS Filed July 2, 1951 2 Sheets-Sheet 2 Inventor.-

United States Patent MANUFACTURE OF PAPER BAGS Carl Honsel, Bielefeld, Germany Application JuIy Z, 1951, Serial No. 234,700

Claims priority, application Germany September 26, 1950 Claims. (CI. 93-23) This invention relates to the manufacture of paper bags and more particularly to apparatus for the production of so-called cross-bottom paper bags from continuous lengths of paper tubes. With known machines for the manufacture of cross-bottom paper bags it is not possible to produce bags with cross bottoms having overlapping flaps across the middle thereof. For opening up the cross bottom in a machine, a so-called nose is used and this does not permit the production of overlapping bottom flaps. The lack of such overlap is very disadvantageous when a powder-tight bottom is required, because the powder material very easily trickles out at the joint.

The object of the present invention is to avoid the drawback aforesaid and to provide apparatus which enables the production of paper bags having cross-bottoms with overlapping flaps.

In the apparatus of the present invention, upon the opening up of the tube, one bottom flap is held back until the other bottom flap has reached the pressing roller. The means to be used for this purpose suitably comprises a tube opening nose having a one-sided shoe which bears in advance on one bottom flap, whilst the second bottom flap is initially held back by cheek or deflector located on the bridge piece of the nose. It is of advantage to have the pressing roller adjustable as to distance from the tip of the nose and for this purpose such roller may be mounted so as to be swingable around the axis of the nose-folding cylinder whereby it can be adjusted around a suitable arc.

By the above apparatus, cross bottoms are produced having a stronger and tighter closure, so that leakage of powder and other materials is no longer possible. By the use of known incisions in the end of the tube at which a cross bottom is to be formed it is made possible by this invention to produce square bottoms having a large overlap of the two flaps. With known means it was not possible to produce square bottoms with adequate overlap of the flaps, one reason being that there was not sufiicient paper available at this point for the purpose in question.

In order to enable the invention to be readily understood, reference is made to the accompanying drawing illustrating one practical arrangement by way of example, in which drawing:

Figure l is a side elevation of a paper bag making machine with a nose part constructed and operating in accordance with the present improvements.

Figure 2 is a plan of Figure 1.

Figure 3 is an elevation of a portion of tube formed with incisions in the end at which a cross bottom is to be formed.

Figure 4 is an elevation showing the flaps of a cross bottom laid down with overlapping flaps.

Figure 5 is an elevation showing the finished cross bottom.

Figure 6 is a plan, to a larger scale, of the nose of Figure 1 as seen when looking in the direction of the arrow A, and

Figs. 7, 8 and 9 are, respectively, views of the nose shown in Fig. 6 in side elevation, front elevation, and plan.

The length of tube 1 is provided in known manner with incisions 2 and is delivered to the bottom-folding cylinders 3, 4 including a main cylinder or roller 3 and a pair of counterrollers 4 arranged parallel to the main roller 3 at a distance from each other. The counterrollers 4 engage the main roller 3 so as to advance a length of the tube I inserted between the main roller 3 and the counterrollers 4. By means of known suction elements 5 in the cylinder 4 and grippers 6 in the cylinder 3, the

- length of tube is opened at the end and slid upon an angular nose 7 including (see Figs. 7-9) a substantially straight part 71 arranged at an angle to the circumference of the main roller 3 and a part 72 curved along a circular are adjacent tothe center line 74 (Fig. 2) of the circumference of the main roller 3. The fingers 8 hold the tube 1 securely at the nose fold 9 and deliver it under the nose 7. The bottom flaps 10 and 11 would then tend to fold over inwardly at the same time. Due to the onesided bend in the nose 7 and to the one-sided disposition of the shoe 12 rigidly connected to the curved part 72 of the nose 7 (see Figs. 2 and 6), the bottom flap 11 is given the opportunity to fold over earlier than the bottom flap 10. The bottom flap 10 is, rather, held up by the cheek or deflector 13 rigidly connected or forming one piece with the straight part 71 of the nose 7 until the point of the bottom flap 11 has passed under a pressing roller 14. Thereupon, the bottom flap 10 is also laid over, overlapping the bottom flap 11, by the other pressing roller 14.

In order to be able to determine precisely the instant at which the pressing roller 14 is to become elfective in the folding over of the first bottom flap, the distance of the pressing roller 14 from the tip of the nose 7 may be made adjustable. For this purpose, the pressing roller may be made swingable concentrically about the nosefolding cylinder 3. To this end an arm 20 (Fig. l) is swingably and adjustably mounted on the axis of the conveying main cylinder or roller 3. The pressure roller 14 is rotatably mounted on the arm 20 which may be held in a predetermined position by a setting screw 21 whereby the pressure roller 14 may be held in a predetermined position relative to the tip of the nose 7.

I claim:

1. An apparatus for the manufacture of cross-bottom paper bags from lengths of paper tubes, comprisingtin combination: a main roller, a pair of counterrollers arranged parallel to said main roller at a distance from each other and engaging said main roller so as to advance a length of paper tube inserted between said main roller and said counterrollers, an angular nose including a substantially straight part arranged at an angle to the circumference of said main roller and a part curved along a circular are adjacent to the center line of said circumference of said main roller, said nose being arranged substantially in a continuation of the center line of the advancing tube for penetrating into the open end thereof and spreading same into diamond shape with upwardly extending bottom flaps at both sides of the center line of the tube, a shoe rigidly connected to said curved part of said nose and being arranged at one side of said curved part of said nose, said shoe projecting laterally from the center line for engaging the bottom flap at this side of the center line and causing a laying down thereof during the advancing of the tube, a deflector rigidly connected to said straight part of said nose and being arranged at the opposite side of said nose in a position for preventing temporarily a laying down of the second bottom flap at said opposite side of the center line until the first mentioned flap is laid down so as to assure an overlapping of said bottom flaps, and at least one pressure roller cooperating with one of said rollers for depressing the laid down bottom flaps.

2. In an apparatus as claimed in claim 1, the circular distance along the circumference of said main roller of said presser roller from the tip of said nose being adjustable, and setting. means associated with said pressure roller for setting same in a predetermined position.

3. In an apparatus as claimedin claim 1, supporting means swingable about the axis of the main roller cooperating with said'pressurc roller, said supporting means carrying said pressure roller, and setting means asso ciated with said supporting means for holding same in a predetermined position whereby said pressure roller may be set in. a predetermined position relative to the tip of. said nose,

4. In an apparatus as claimed in claim 1, gripping 4 means on said main roller for gripping the length of tube, and suction means on said counterroll'er for action on said length of tube.

5. In an apparatus as claimed in claim 4, the circular distance along the circumference of said main roller of said pressure roller from the tip of said nose being adjustable, and setting means associated with said pressure roller for setting same in a predetermined position.

References Cited in the file: of this patent UNITED STATES PATENTS 585,280 Murchie June 29, 1897 1,176,163 Potdevin Mar. 21', 1916 2,126,920 Potdevin: Aug. 16, 1938 2,565,258 Nicholas Aug. 21, 1951 

